JPH05195354A - Roving cutter of roving exchanger - Google Patents

Abstract

PURPOSE:To certainly cut a fresh roving nipped by a roving-piecing head so as not to interface piecing of roving. CONSTITUTION:A roving cutter member 33 is attached to a suction nozzle 29 and the suction nozzle 29 is set so as to be movable between a roving end suction position higher than that of a roving-piecing head and a roving-guiding position lower than that of the roving-piecing head. The roving-piecing head is equipped with a nipping member having a roving-guide groove formed on the top part and nipping a fresh roving introduced into the above-mentioned guide groove. The roving cutter member 33 is equipped with a comb 36 having many projected needles 36a as a hooking unit for hooking a roving when being relatively moved upward at a position higher than the inlet part 29a outside the suction nozzle 29. A guide unit 35a capable of guiding the roving to the lower side of the comb 36 in elevation of the suction nozzle 29 is attached to the upper side of the comb 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention exchanges a roving bobbin being spun on a creel of a spinning machine (spool) and a full bobbin suspended on a spare roving rail (spare roving). Prior to the replacement work by the roving yarn changer, the roving yarn end pulled out from the full bobbin at the time of performing the roving yarn joining operation is sure to have a predetermined length and its tip is the tip of the brush. The present invention relates to a roving yarn cutting device in a roving yarn changer capable of cutting into a uniform shape.

[0002]

2. Description of the Related Art In a spinning machine, especially a ring spinning machine, a roving yarn is drawn out from a roving reel wound on a creel and supplied to a draft part below. When the supply of roving to the draft part progresses and the roving winding becomes empty or approaches empty, it is necessary to replace it with a new roving winding.At that time, the roving end of the roving winding to be newly replaced with the roving being spun It is necessary to splice the roving. Conventionally, this roving splicing operation was generally performed manually, but in recent years, automation of the roving splicing operation has been proposed.

As a roving splicing method using a roving splicing machine, a new roving to be spliced in a roving (shino) guide groove of a roving (shino) splicing head is polymerized with an old roving being spun. Along with the feeding of the old roving, the overlapping portion is guided to the back roller of the draft part, and the overlapping portion of the new roving and the old roving is held by the back roller, and then the old roving is held by the roving holding member. A method of cutting is proposed in JP-A-62-57957. However, in this method, the new roving is guided by the old roving and moves at the peripheral speed of the back roller, and there is a long waiting time until the overlapping section reaches the gripping position by the back roller through the trumpet, and the roving joining is completed. There is a problem that it takes a long time. In particular, when spinning a fine yarn of high-quality yarn, the spinning speed is slow and the peripheral speed of the back roller is slow, so that the roving joint time becomes long.

As a roving splicing method for solving this problem, a roving (old roving) connected from the roving winding during spinning to the trumpet of the draft part and a preliminary roving to be replaced with the roving are drawn. A roving splicing head that can hold the roving (new roving) is provided, and the roving splicing head is moved to a work position near the upper part of the draft part while gripping the new roving, and spinning is performed at that position. Grasp and cut the old roving with the roving splicing head, then release the old roving while gripping the new roving,
A roving splicing method in which a roving splicing head is rotated to insert a new roving into a trumpet is disclosed in Japanese Patent Laid-Open No. 2-112426.

As a method of taking out the roving thread end from the preliminary roving bobbin (full bobbin), grasping it with the roving splicing head, and cutting the roving thread end, Japanese Unexamined Patent Publication (Kokai) No. 62-57957 discloses a method for changing the roving thread. After suctioning the roving thread end from the surface of the preliminary roving winding with the suction pipe equipped in the machine and moving the roving thread end, the suction pipe is moved below the roving splicing head located downward. The roving yarn is guided to the gripping portion, and in that state, the roving yarn splicing head is rotated upward to cut the roving yarn after gripping the roving yarn by the gripping portion.

Further, in Japanese Patent Laid-Open No. 2-112426, etc., after the roving yarn end is sucked from the surface of the preliminary roving winding by a suction nozzle equipped in the roving yarn changing machine and is ejected, the suction nozzle is sucked while sucking the roving yarn end. The lower part of the roving splicing head located downward, and then rotating the roving splicing head upward to introduce the middle of the roving from the preliminary roving spool to the suction nozzle and grasp it. After the roving yarn is gripped at the section, the roving yarn joining head is reciprocally rotated in the vertical direction to cut the roving yarn.

The suction pipe (suction nozzle) is equipped with a known roving yarn cutting member (for example, Japanese Patent Publication No. 47-51649), and the roving yarn splicing head is moved away from the suction pipe while the roving yarn is held. By rotating the roving, the roving is cut between the roving splicing head and the suction pipe. That is, as shown in FIG. 18, the suction pipe 60
Comb 6 as a roving cutting member near the inner entrance
1 is fixed so that its tip is inclined toward the downstream side of the suction pipe 60. The tip of the comb 61 is formed in a saw-tooth shape. Then, when the roving splicing head (not shown) moves in a direction in which the new roving R is sucked by the suction pipe 60, the new roving R
Are pulled in a direction of coming out of the suction pipe 60. At this time, the comb 61 bites into the new roving R, and the new roving R is partially gripped by the roving splicing head and pulled while the comb 61 is partially gripped by the roving splicing head and the suction pipe. Be cut in between.

[0008]

However, since the comb 61 is provided inside the suction pipe 60 in the conventional new roving cutting method, the roving length after cutting varies or the roving is cut. There was a problem of uncertainty. This is because the new roving yarn is cut at the weakest part between the two gripping portions, so the longer the distance from the new roving yarn gripping portion of the roving joint head to the comb 61 which is the gripping portion on the downstream side, the longer the cutting position. Variation occurs. Further, in order that the comb 61 bites into the new roving R and grips it securely, the part of the comb 61 is kept in a predetermined state by the suction action of the suction pipe 60 while the roving of a certain length is connected downstream from the comb 61. It is necessary to receive a tension equal to or more than the value, but the new roving R may be torn in the suction pipe 60 and the length on the downstream side of the comb 61 may become short, resulting in uncertain roving cutting. ..

If the end portion of the new roving yarn held by the roving yarn splicing head after cutting is long, the tip of the new roving yarn comes into contact with the inner wall of the trumpet during insertion into the trumpet, causing bending. Even if the paper is jammed in the trumpet or sent out from the trumpet outlet to the back roller side, it may be introduced into the roller part in a bent state. If the tip of the new roving is introduced into the roller part in a bent state, the bent part cannot be grasped between the rollers in the roller part, and it passes in an incomplete draft.
The yarn spun from the front roller becomes a slab and the balloon becomes too large, and the yarn is caught by the slab catcher of the snell wire and broken. Also, if it is inserted into the trumpet without bending, the overlapping portion (coarse yarn joint) between the new roving and the old roving will become long, and the balloon of the yarn spun from the front roller will be too large, and the slab catcher will become too large. It will be caught in the thread and the thread will be broken.

In order to surely cut the new roving yarn at a position where the end thereof has a predetermined length from the grip portion of the roving yarn splicing head, it is conceivable to equip the roving yarn splicing head with a cutter. But,
When the roving yarn is cut by the cutter, there are many fibers at the roving yarn end that are shorter than the distance between the grips of the rollers of the draft part, and the roving yarn in that portion is spun in a slab shape without being drafted. There is a problem that the ballooning changes sharply due to a large centrifugal force when the part is wound up and the yarn breaks.

The present invention has been made in view of the above problems, and an object thereof is to reliably cut a new roving yarn grasped by a roving yarn splicing head into a length that does not hinder the roving yarn splicing. It is to provide a roving yarn cutting device in a roving yarn changer.

[0012]

In order to achieve the above object, in the invention according to claim 1, a roving guide groove is formed at the tip and a new roving introduced into the roving guide groove is provided. Outside the suction means provided movably between the roving yarn end suction position above the roving yarn splicing head equipped with a gripping member and below the roving yarn splicing head, and from the inlet portion. A locking portion that can lock the roving yarn when the roving yarn moves relatively upward is provided above the locking portion. A guide part that can be guided to the side is provided.

In addition to the above construction, a second locking portion capable of locking the roving yarn is provided at the upper part of the inlet in the suction means.

[0014]

The suction means sucks the roving thread end from the surface of the preliminary roving winding while the suction means is located at the roving thread end suction position above the roving thread splicing head, and then the roving thread splicing is performed while sucking the roving thread end. It is moved to the bottom of the head. Then, after the intermediate portion of the roving yarn connected to the suction means from the preliminary roving yarn winding is gripped by the gripping portion of the roving yarn splicing head, the suction means is raised, and the roving yarn is guided to the lower side of the locking portion when rising. Next, the suction means is lowered, and the roving yarn tries to move upward relative to the suction means. At this time, the roving yarn is locked by the locking portion, and the roving yarn is pulled while being partially gripped by the roving yarn splicing head and partially locked by the locking portion, so that the roving yarn splicing head and the suction pipe are Be cut in between.
After the locking part is moved to the vicinity of the roving yarn gripping part of the roving splicing head, it is lowered so that the roving yarn is pulled out near the gripping point of the roving splicing head and the length from the gripping point to the roving end Is cut so that the length becomes almost the same as the fiber length, and the length becomes uniform.

Further, in the invention described in claim 2, the roving yarn sucked in the suction roving yarn is cut because the suction action of the suction means is too strong, and the tension acting on the roving yarn is weakened. Even in such a case, when the roving yarn tries to move in the direction of being pulled out from the suction means, the second locking portion locks the roving yarn and a predetermined tension is applied to the roving yarn. As a result, the roving yarn is reliably locked to the first locking portion, and the roving yarn is cut so that the length from the gripping point to the roving yarn end is almost the same as the fiber length, and the length is uniform. ..

[0016]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS. The roving splicing device moves along the spinning frame to perform roving replacement work (see FIG. 5).
It is equipped with a part of the external shape). Roving changer 1
The basic configuration such as the disposition position of the roving splicing device is the same as that disclosed in Japanese Patent Application Laid-Open No. 2-127368 previously proposed by the applicant of the present application.

As shown in FIGS. 3 and 4, the roving splicing head P is used.
H is rotatably supported by the tip of the support arm 2 of the roving joining device. The support arm 2 is arranged by a driving device (not shown) to rotate the roving splicing head PH at a roving splicing position above the draft part and a standby position and a new roving gripping position that do not hinder the movement of the roving changer. It has become so. As shown in FIG. 4, a substantially U-shaped mounting portion 2a is formed at the tip of the support arm 2, and the rotary shaft 3 is supported in a state of protruding laterally of the mounting portion 2a. A toothed pulley 4 is integrally rotatably fitted and fixed at a position corresponding to the inside of the mounting portion 2a of the rotating shaft 3, and the toothed pulley 4 and the drive shaft of the motor fixed to the base ends of the support arms 2 are fixed. The toothed belt 5 is wound around a toothed pulley (not shown) fitted to the. Then, the roving splicing head PH is integrally rotatably fixed to the rotation shaft 3 of the portion projecting to the side of the mounting portion 2a so that the roving splicing head PH is rotated by the drive of the motor. There is. When a servo motor, a stepping motor, or the like is used as the motor, it is easy to adjust the rotation angle of the roving joining head PH.

A bulging portion 6a having an inclined surface which descends and slopes rearward is formed at the tip of the head body 6 of the roving splicing head PH, and the tip of the spinning portion 6a guides the roving to the draft part 7. The trumpet 8 (both of which are shown in FIG. 14) is formed into a shape that can enter the inside. A roving guide groove 9 is formed at the tip of the head body 6 so as to extend in the longitudinal direction and the up-down direction of the head body 6. The bulging portion 6a is provided with a notch 10 on one side of the swelling portion 6a, which communicates with the roving yarn guiding groove 9 and opens the roving yarn guiding groove 9 rearward and laterally of the bulging portion 6a. Has been formed.

A block 11 having the cutout portion 10 is separately formed in the head main body 6, and is integrally fixed to the head main body 6 with a screw or the like not shown. As shown in FIG. 2B, the block 11 has a flat recessed portion 13 forming an injection nozzle 12 for injecting a compressed air flow, which is located above the cutout portion 10 and in front of the cutout portion 10 above and above the roving yarn. The guide groove 9 side is formed in an open state, and the roving guide groove 9 side is covered by the plate 14. The plate 14 is fixed so as to be flush with the roving guide groove 9. A fitting hole 15 is formed in the block 11 so as to communicate with the recess 13 from the side opposite to the roving guide groove 9, and one end of the fitting hole 15 is connected to a compressed air source (not shown) such as a compressor. The other end of the pipe 16 is fitted. The pipe 16 is equipped with a control valve 17 capable of adjusting the flow rate for controlling the injection timing of the compressed air from the injection nozzle 12.

A support pin 18 is rotatably attached to the head body 6 at the rear of the bulging portion 6a in a state of protruding to both upper and lower sides of the head body 6. A gripping member 19 for gripping the new roving R2 is attached to the lower end of the support pin 18 so as to be integrally rotatable at its base end, and a lever 20 is provided at the upper end at one end thereof in a state of extending along the longitudinal direction of the head body 6. It is fixed so that it can rotate together. The tip of the gripping member 19 is inserted into the cutout portion 10, and the support pin 18
The rotation of the gripping portion 19a causes the gripping portion 19a to enter the roving yarn guiding groove 9 and cooperate with one wall surface 9a of the roving yarn guiding groove 9 to grip the new roving R2, and the gripping portion 19a. Rough thread guide groove 9
It is movably arranged at a standby position which is retracted from the inside to allow the movement of the roving yarn in the roving yarn guide groove 9.

A support block 21 is integrally rotatably fixed near the support arm 2 of the rotary shaft 3, and a support plate 22 is fixed between the support block 21 and the upper surface of the base end of the head body 6. A support column 23 is erected at one end of the support plate 22 (close to the support arm 2), and a plate 24 is fixed to the tip of the support column 23. An air cylinder 25 is supported by the plate 24 at its base end via a support shaft 26 so as to extend in a direction orthogonal to the head body 6. The air cylinder 25 has its piston rod 25a.
Is rotatably connected to the other end of the lever 20 via a pin 27. The grip member 19 is rotated via the lever 20 by the operation of the air cylinder 25. A cover 28 that covers the lever 20 and the air cylinder 25 is attached to the roving joining head PH via an attachment member (not shown) fixed to the support plate 22. The tip of the cover 28 extends to near the center of the roving thread guide groove 9, and a groove 28a is formed at a position corresponding to the roving thread guide groove 9.

As shown in FIG. 5 and the like, a suction nozzle 29 as a suction means is arranged at a position corresponding to the roving splicing head PH arranged at the standby position. Suction nozzle 29
Is fixed to the tip of the suction pipe 30 and is removed from a spare roving winding rail (not shown) so as to facilitate the spouting work, and a spare roving winding (full bobbin) F is supported on the full bobbin lifting device 31. A roving yarn end suction position above the corresponding roving yarn splicing head PH and a roving yarn introduction position / standby position below the roving yarn splicing head PH are movably provided by the action of a drive mechanism (not shown). There is. The suction pipe 30 is connected to a cotton collection box (not shown) that produces a suction action by driving a blower as a suction source. The peg 31a mounted on the full bobbin lifting / lowering device 31 is rotatable by a drive mechanism (not shown).

As shown in FIG. 1, the suction nozzle 29 is formed in two and is fixed by screws 32. It may be integrally formed instead of being divided into two. A roving cutting member 33 is fastened and fixed to the outside of the suction nozzle 29 with a screw 34. The roving cutting member 33 is composed of a support plate 35 having an upper portion formed in a substantially triangular shape, and a comb 36 fixed at a position corresponding to the base of the triangular shape with the needle 36a facing downward. The comb 36 is formed by fixing a large number of needles 36a to a thin plate. The roving yarn cutting member 33 is a needle 36 as a locking portion that can be locked to the roving yarn when the roving yarn moves relatively upward above the inlet portion 29a of the suction nozzle 29.
It is fixed so that a is located. The two hypotenuses of the triangular portion of the support plate 35 guide the roving yarn to the lower side of the needle 36a when the suction nozzle 29 rises.
Are configured. The material of the roving cutting member 33 is not particularly limited to metal, resin, ceramics, etc., but stainless steel is preferable from the viewpoint of rust prevention. Further, in this embodiment, since the roving yarn cutting member 33 is attached to the suction nozzle 29 with the screw 34, when the roving yarn cutting member 33 needs to be replaced due to damage of the needle 36a or the like, The work becomes easier as compared with the case where the suction nozzle 29 is fixed by welding, brazing, or adhesion.

Next, the operation of the apparatus configured as described above will be described. When the new roving R having the roving end projected from the full bobbin F is gripped by the roving splicing head PH, the roving splicing head PH is arranged downward at the standby position as shown in FIG. Numeral 19 is arranged at a standby position where the roving yarn can freely penetrate into the roving yarn guide groove 9. On the other hand, the full bobbin F is removed from the preliminary roving winding rail by the full bobbin lifting device 31 and is arranged at a position near the roving splicing head PH that is easy to put out. In this state, the suction nozzle 29 is lifted from the standby position (original position) and, as shown in FIG. 6, is arranged at the roving yarn end suction position above the roving joint head PH and close to the lower peripheral surface of the full bobbin F. To be done. The suction force is applied from the suction source to the suction nozzle 29 through the suction pipe 30 during or after the suction nozzle 29 is lifted.

After the suction nozzle 29 is placed at the roving yarn end suction position and the suction force is applied to the suction nozzle 29, the peg 31a of the full bobbin lifting device 31 makes one or more revolutions in the slacking direction. It is preferably rotated about 1.5 times. While the full bobbin F rotates, the roving yarn end is brought into a state corresponding to the inlet portion 29a of the suction nozzle 29, at which point the roving yarn end is sucked by the suction nozzle 29. Full bobbin F is 1
After being rotated by a predetermined amount of rotation or more, the suction nozzle 29 is lowered. At this time, the full bobbin F is rotated at a speed corresponding to the descending speed of the suction nozzle 29 in the direction in which the roving yarn is fed out, and the roving yarn is pulled out from the full bobbin F without breaking as the suction nozzle 29 moves downward. After the suction nozzle 29 descends to the original position, the rotation of the peg 31a is stopped and the state shown in FIG. 7 is obtained. The original position also serves as the roving introduction position.

Next, a motor (not shown) is driven, and the roving splicing head PH is rotated counterclockwise from the downward standby position shown by the chain line in FIG. 7 and placed at the horizontal position shown by the solid line. At this time, since the gripping member 19 is arranged at the standby position, the new roving R is introduced into the roving guide groove 9 as the roving joining head PH rotates. Then, the air cylinder 25 is operated in a state where the new roving R is introduced deep into the roving guide groove 9, and the gripping member 19 is rotated together with the lever 20 by the protrusion operation of the piston rod 25a. And FIG.
As shown in (b) and FIG. 4, the gripping portion 19a is arranged at the roving thread gripping position where the new roving thread R is pressed against the other wall surface 9a of the roving thread guide groove 9, and the new roving thread R is roving joint head PH. Is gripped by.

Next, the cutting action of the new roving R will be described. As shown in FIGS. 8 to 12, the suction nozzle 29 is not on the extension line of the roving yarn guide groove 9 of the roving yarn joining head PH, but is on a slightly displaced position. When the suction nozzle 29 is lifted up again from the original position in a state where the end portion of the new roving R held by the roving splicing head PH is sucked by the suction nozzle 29, FIGS. 9A and 9B are shown. As shown in, the guide portion 35a of the roving cutting member 33 starts to engage with the new roving R during the ascent, and the new roving R slides down along the guide 35a as the suction nozzle 29 rises. Then, as shown in FIG.
As shown in (b), when the lower end of the guide portion 35a reaches above the lower end of the bulging portion 6a of the roving joint head PH, the new roving R is guided to a position directly facing the needle 36a on one side of the comb 36. To be done. The suction nozzle 29 is further raised from the state shown in FIGS. 10 (a) and 10 (b), and
As shown in FIG. 5, when the upper end of the inlet portion 29a of the suction nozzle 29 reaches above the lower end of the bulging portion 6a, the rise of the suction nozzle 29 is stopped. When the suction nozzle 29 rises, the new roving R does not engage with the needle 36a, so the new roving R does not loosen when rising.

Next, the suction nozzle 29 is lowered, and the new roving R is locked to the needle 36a of the comb 36 during the lowering as shown in FIGS. 12 (a) and 12 (b). One of the new rovings R is gripped by the roving joint head PH, and the other is the suction nozzle 29.
Since the needle 36a is in a state in which the needle 36a is sucked in and tensioned, the needle 36a is reliably locked. Then, when the suction nozzle 29 further descends from this state, the fibers of the new roving R are pulled out between the grip point of the roving joint head PH and the comb 36 by the action of the comb 36, as shown in FIG. Disconnected in the state. Since the new roving R is pulled out near the gripping point, the length from the gripping point to the end of the roving is almost the same as the fiber length, and the roving is reliably cut like a writing brush. The roving yarn on the side of the suction nozzle 29 after cutting is accommodated in a cotton collection box (not shown) through the suction pipe 30 by the action of the suction air flow.

After cutting the new roving R, the roving splicing head P
Rotate H clockwise to raise the suction nozzle 29 again,
The descent may be repeated to suck the end of the new roving R. or,
In the apparatus of this embodiment, since the guide portion 35a and the comb 36 are provided on both left and right sides of the center line of the suction nozzle 29, the new roving R is always guided to the lower side of the comb 36 when the suction nozzle 29 is raised. To be done.

After the cutting of the new roving R, the support arm 2 is tilted toward the spinning machine base side, and the roving splicing head PH is moved to the roving splicing operation position near the upper part of the draft part. The old roving R1 being spun is introduced into the roving guide groove 9 while the roving joining head PH is moving to the roving joining position.
Since the gripping member 19 is arranged at the roving thread gripping position, the old roving thread R1 is prevented from moving to the inner side from the tip of the gripping member 19, and the old roving thread R1 is located at a position corresponding to the jet nozzle 12. Held in. After the roving splicing head PH is placed at the roving splicing operation position, the control valve 17 is opened at the same position, and the compressed air is jetted from the jet nozzle 12 at a predetermined pressure corresponding to the type of spun yarn. Since the injection port of the injection nozzle 12 faces upward, the injection airflow acts to pull the old roving R1 upward. Then, the old roving R1 is cut like a writing brush in a state where the single fibers are unwound at a predetermined position where the jet airflow hits. The old roving R1 after cutting is in a state of hanging down to the rear of the trumpet 8 as shown in FIG.

Next, the motor is driven to drive the roving splicing head PH.
Is rotated clockwise from the position in FIG. 14, and the end of the new roving R is inserted into the trumpet 8. When the end of the new roving R is supplied to the back roller 7a of the draft part 7, the air cylinder 25 is actuated and the gripping of the new roving R by the gripping member 19 is released. And the new roving R is the old roving R
The roving is spliced by passing through the back roller 7a in a state of being superposed on No. 1, and thereafter the spinning is continued by the new roving R. The end of the new roving R is cut like a brush without cutting the monofilament, and therefore passes through the draft part 7 while being drafted between the front and rear rollers, and the slab yarn at the cutting part of the new roving R is cut. The occurrence of yarn breakage due to the sudden increase in the size of the balloon is eliminated. In addition, since the new roving R is cut to a length substantially equal to the fiber length from the gripping point to the end of the roving, the balloon of the yarn spun from the front roller becomes too large and is caught by the slab catcher, resulting in yarn breakage. As a matter of fact, the length of the polymerized portion (the roving joint) at the time of joining the roving does not become long.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. In this embodiment, the construction of the roving cutting member 33 is different from that of the above embodiment. As shown in FIG. 16, the roving cutting member 33 is a comb having a pair of support plates 35 formed in a substantially triangular shape on the front surface and having a hypotenuse serving as a guide portion 35a, and a plurality of needles 36a forming a first locking portion. 36
And a second needle 37 that constitutes a second locking portion. The second needle 37 also functions as an attachment portion for attaching the roving cutting member 33 to the suction nozzle 29, and the needle 3
The upper part of 7 is fixed in a state of being sandwiched by a pair of support plates 35. Further, the second needle 3 is provided near the tip of the second needle 37.
In order to prevent 7 from excessively digging into the new roving R, a thin plate 37a that also serves to integrate a plurality of second needles 37 is fixed.

As shown in FIG. 15, the roving cutting member 33 has a second needle 37 at the upper portion of the inlet portion 29a in the suction nozzle 29.
Are fixed by screws 34 in a state of protruding. Second
The protrusion amount of the needle 37 of the new roving R
Is set to a value that does not raise the new roving R by overcoming the suction force of the suction nozzle 29 even when engaged with.

In the apparatus of the above embodiment, when the suction nozzle 29 is lowered from the state of FIGS. 12 (a) and 12 (b), the needle 36a
In order to reliably lock the new roving R, it is necessary that the new roving R be in a state of being applied with a tension of a certain value or more due to the suction action. In order to apply the required tension to the new roving R, the new roving R, which is sucked by the suction nozzle 29 and is subjected to the suction action, must have a certain length or more. On the other hand, when the roving yarn end is sucked from the full bobbin F, even if the roving yarn end is strongly pressed against the roving yarn wound on the full bobbin F, the roving yarn end is surely sucked,
Alternatively, in order to secure the suction force even when the suction force is relatively quickly reduced due to the effect of the collected cotton (crude yarn) due to the small capacity of the cotton collection box equipped in the roving yarn changer 1, the suction source It is necessary to increase the suction power of. Therefore, the new roving R sucked in the suction pipe 30 is broken and the needle 36
In some cases, the tension necessary for a to securely lock the new roving R is not applied to the new roving R. In that case, the needle 36a cannot reliably lock the new roving R, and the cutting of the new roving R is not reliably performed at the predetermined position.

However, in the device of this embodiment, the suction action of the suction nozzle 29 prevents the needle 36a from reliably engaging the new roving R with the tension necessary to reliably lock the new roving R. Is lowered from the state corresponding to FIGS. 12 (a) and 12 (b) and the new roving R tries to move relatively in the direction of coming out of the suction nozzle 29, the second needle 37
Locks the new roving R. As a result, the new roving R between the roving splicing head PH and the suction nozzle 29 receives the tension necessary for the needle 36a to securely lock the new roving R,
As the suction nozzle 29 descends, the needle 36a securely locks the new roving R, and the new roving R is reliably cut at a predetermined position as in the above-described embodiment. That is, in the apparatus of this embodiment, the new roving R can always be reliably cut to a predetermined length without being affected by the suction force of the suction source. Also, the second needle 37
Does not excessively dig into the new roving R, the roving after cutting held by the second needle 37 is sucked and removed by the suction action of the suction nozzle 29.

The present invention is not limited to the above-described embodiments, and for example, the arrangement pitch of the needles 36a of the comb 36 and the length of the needles, or the arrangement pitch of the second needles 37 in the second embodiment. Alternatively, the amount of protrusion into the suction nozzle 29 may be appropriately changed depending on the type of fiber and the thickness of the roving.
Further, as shown in FIG. 17A, the roving yarn cutting member 33 having a shape obtained by cutting the roving yarn cutting member 33 of the first embodiment into half halves 36.
Or use a large number of needles 36 as shown in FIG. 15 (b).
Instead of forming the comb 36 from a, the comb 36 may be formed of a thin plate having a sawtooth cut. Further, in both of the above-mentioned embodiments, the needle 3 serving as the locking portion or the first locking portion.
Although 6a is arranged so as to extend parallel to the end surface of the inlet portion 29a of the suction nozzle 29, it may be arranged at an angle to the end surface of the inlet portion 29a.

Further, the cutting of the old roving R1 is not limited to the method of the above-mentioned embodiment using compressed air, but an appropriate method may be adopted. In the case of spinning a fiber having a long fiber length, the gripping member 19
Is arranged above the head main body 10 to increase the distance from the gripping point of the new roving R to the lower end of the bulging portion 6a, and the length of the fibers protruding from the lower end of the roving joint head PH is transferred to the trumpet 8. The length may be set so as not to interfere with insertion of the. Further, the roving splicing device may be equipped with two roving splicing heads PH or a set of three or more roving splicing heads PH, and may be applied to a device for performing roving splicing operation for a plurality of spindles at the same time. Furthermore, the invention is not limited to a roving splicing device that performs so-called additional splicing for cutting the old roving R1 before inserting the new roving R into the trumpet 8.
New roving R as in the device disclosed in Japanese Patent No. 957, etc.
May be applied to a roving splicing device that cuts the old roving R1 after inserting into the trumpet 8.

[0038]

As described above in detail, according to the present invention, when the roving yarn end is ejected from the preliminary roving yarn winding, the new roving yarn held by the roving yarn splicing head is almost completely separated from the gripping point by the roving yarn splicing head. Since the length of the roving yarn protruding from the roving yarn splicing head can be reliably cut with a long length, it will be constant if the spinning conditions are the same, and the roving yarn end will contact the wall surface of the trumpet during roving yarn splicing. As a result, it is possible to surely prevent the bending and the length of the overlapped portion with the old roving yarn (the roving joint) to be longer than necessary, and the roving joint success rate is improved.

[Brief description of drawings]

1A is a rear view showing a state in which a roving cutting member of a first embodiment is attached to a suction nozzle, and FIG. 1B is a side view.

FIG. 2A is a front view of a roving cutting member, and FIG. 2B is a vertical cross-sectional view of a roving splicing head tip portion.

FIG. 3 is a side view of a roving splicing head.

FIG. 4 is a plan view of the roving splicing head with the cover removed.

FIG. 5 is a side view showing a state in which the full bobbin is arranged at the roving yarn outlet position, and the suction nozzle and the roving yarn splicing head are arranged at the standby position.

FIG. 6 is a side view showing a state in which a suction nozzle is arranged at a roving end suction position.

FIG. 7 is a side view showing a state in which new roving is introduced into a roving guide groove of the roving splicing head.

FIG. 8A is a side view showing a positional relationship between a suction nozzle arranged at a roving yarn introduction position and a roving yarn splicing head, and FIG. 8B is a front view.

9A is a side view showing a state in which a suction nozzle is raised to a position where a guide portion is engaged with a new roving, and FIG. 9B is a partially omitted A arrow view thereof.

FIG. 10 (a) is a side view showing a state where the suction nozzle is raised to a position where the new roving is guided to the lower side of the locking portion,
(B) is the partially omitted B arrow view.

11A is a side view showing a state in which the suction nozzle has reached the highest position during the roving cutting operation, and FIG. 11B is a partially omitted C arrow view thereof.

FIG. 12 (a) is a side view showing a state where the suction nozzle is raised to a position where the new roving is locked by the locking portion, and FIG. 12 (b) is a partially omitted D arrow view thereof.

FIG. 13 is a side view showing a state in which a new roving is cut.

FIG. 14 is a side view showing a state in which the old roving after cutting hangs down from the trumpet.

FIG. 15 is a side view showing how the roving cutting member of the second embodiment is attached to the suction nozzle.

16 (a) is a front view of a roving cutting member of a second embodiment, and FIG. 16 (b) is a side view.

FIG. 17 is a front view of a roving cutting member of a modified example.

FIG. 18 is a side sectional view showing an attached state of a conventional roving cutting member.

[Explanation of symbols]

Reference numeral 9 ... Rough yarn guide groove, 19 ... Gripping member, 29 ... Suction nozzle constituting suction means, 29a ... Inlet portion, 30 ... Suction pipe constituting suction means, 33 Rough yarn cutting member, 35a ... Guide portion, 36 ... Comb, 36a ... Needle as locking portion or first locking portion, 37 ... Second needle as second locking portion, F ... Full bobbin, PH ... Rough yarn splicing head, R ... New roving yarn ,
R1 ... Old roving.

Continuation of the front page (72) Inventor Yoshihiro Tange 2-1-1 Toyota-cho, Kariya city, Aichi stock company Toyota Industries Corp.

Claims (2)

[Claims] 1. A roving yarn end suction position above a roving yarn splicing head having a roving yarn guide groove formed at its tip and provided with a holding member for holding the new roving yarn introduced into the roving yarn guide groove, Outside the suction means provided movably between the roving yarn splicing head and below the roving yarn splicing head, above the inlet, and when the roving yarn moves relatively upward, it can be locked to the roving yarn. A roving yarn cutting device in a roving yarn changer, in which a locking portion is provided, and a guide portion capable of guiding the roving yarn to the lower side of the locking portion when the suction means is raised is provided above the locking portion. 2. A roving yarn end suction position above a roving yarn splicing head having a roving yarn guide groove formed at its tip and provided with a holding member for holding the new roving yarn introduced into the roving yarn guide groove, Outside the suction means provided movably between the roving yarn splicing head and below the roving yarn splicing head, above the inlet, and when the roving yarn moves relatively upward, it can be locked to the roving yarn. A first locking portion is provided, and a guide portion that can guide the roving yarn to the lower side of the first locking portion when the suction means is raised is provided above the first locking portion, and the suction means is provided. A roving yarn cutting device in a roving yarn changer, in which a second engaging portion capable of engaging with the roving yarn is provided in the upper part of the inner port.